The faults in the underground cavern area are the main influencing and controlling factors for the deformation and stability of surrounding rock excavation.Compared with the single fault condition,the deformation characteristics and failure mech-anism of surrounding rock under the condition of fault intersection will be more complicated.Based on the engineering geological conditions and support scheme of the main transformer exhausting wind tunnel of Pan'an Pumped Storage Power Station in Zhejiang Province,FLAC 3D was used to simulate the surrounding rock deformation of the underground cavern in the double fault intersec-tion area,and the deformation differences of the surrounding rock under the three conditions of no fault,only fault F1 existence and fault F1 and F2 intersection were compared.The results show that when a single fault passes through the cavern,the surround-ing rock of the hanging wall of the fault has a tendency to deform horizontally in the direction of the fault tendency,and the de-formation direction of the surrounding rock of the footwall is opposite.Under the support condition,the single fault plays a domi-nant role in the surrounding rock deformation located on the hanging wall of the fault.The deformation of surrounding rock shows obvious fault superposition effect when double faults intersect.However,due to the intervention of supporting measures such as prestressed anchor cables and the intersection difference of faults and caverns,the deformation growth caused by superposition effect is only obvious in some parts of surrounding rock.When there is only a single fault,the deformation of the surrounding rock of the cavern decreases with the increasing of the fault strength.When the double faults intersect,the influence of the fault strength on the deformation of the cavern only shows a clear law in some parts of the cavern,monitoring data at these locations should be given priority when conducting fault mechanical parameter inversion.
关键词
断层交会/围岩变形/叠加效应/FLAC/3D/抽水蓄能电站
Key words
fault intersection/surrounding rock deformation/superposition effect/FLAC 3D/pumped storage power station
维普
万方数据